From Netflix:

When Lauren’s wealthy father dies and leaves her the keys to a
hidden bunker on their estate, what she finds could destroy her
family — and their lives.

From Netflix you can stream this 1 hour 51 minute semi-creepy thriller.

Immediately Lauren Monroe discovers that her father kept a man named Morgan Warner locked in an underground prison for 20 years. Little by little Morgan reveals how corrupt the Monroe family really is.  Horrified with each revelation, Lauren must decide what to do with Morgan and all those family secrets.

From the beginning you must suspend disbelief in questionable details. How could anyone maintain his sanity chained in an underground prison with light for just a few minutes each day?

Not exactly cheery Christmas fare. Expect a good plot twist.